You are doing it wrong. Here’s what fertilizer to use on what houseplants

8. 🥔 Potato Water (Unsalted)
Why: High in potassium, supports growth.
How to Use: After boiling potatoes (no salt!), let water cool completely. Use 1 cup per plant every 2–3 weeks.
Best Used On: Pothos, Philodendron, Spider Plant.
Avoid On: Succulents, cacti—too much moisture, and starch can mold.